发布于3月6日3月6日 Members Alma Linux: CVE-2021-47412: Important: kernel security update (Multiple Advisories) Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/21/2024 Created 09/27/2024 Added 09/26/2024 Modified 09/26/2024 Description In the Linux kernel, the following vulnerability has been resolved: block: don't call rq_qos_ops->done_bio if the bio isn't tracked rq_qos framework is only applied on request based driver, so: 1) rq_qos_done_bio() needn't to be called for bio based driver 2) rq_qos_done_bio() needn't to be called for bio which isn't tracked, such as bios ended from error handling code. Especially in bio_endio(): 1) request queue is referred via bio->bi_bdev->bd_disk->queue, which may be gone since request queue refcount may not be held in above two cases 2) q->rq_qos may be freed in blk_cleanup_queue() when calling into __rq_qos_done_bio() Fix the potential kernel panic by not calling rq_qos_ops->done_bio if the bio isn't tracked. This way is safe because both ioc_rqos_done_bio() and blkcg_iolatency_done_bio() are nop if the bio isn't tracked. Solution(s) alma-upgrade-bpftool alma-upgrade-kernel alma-upgrade-kernel-abi-stablelists alma-upgrade-kernel-core alma-upgrade-kernel-cross-headers alma-upgrade-kernel-debug alma-upgrade-kernel-debug-core alma-upgrade-kernel-debug-devel alma-upgrade-kernel-debug-modules alma-upgrade-kernel-debug-modules-extra alma-upgrade-kernel-devel alma-upgrade-kernel-doc alma-upgrade-kernel-headers alma-upgrade-kernel-modules alma-upgrade-kernel-modules-extra alma-upgrade-kernel-rt alma-upgrade-kernel-rt-core alma-upgrade-kernel-rt-debug alma-upgrade-kernel-rt-debug-core alma-upgrade-kernel-rt-debug-devel alma-upgrade-kernel-rt-debug-kvm alma-upgrade-kernel-rt-debug-modules alma-upgrade-kernel-rt-debug-modules-extra alma-upgrade-kernel-rt-devel alma-upgrade-kernel-rt-kvm alma-upgrade-kernel-rt-modules alma-upgrade-kernel-rt-modules-extra alma-upgrade-kernel-tools alma-upgrade-kernel-tools-libs alma-upgrade-kernel-tools-libs-devel alma-upgrade-kernel-zfcpdump alma-upgrade-kernel-zfcpdump-core alma-upgrade-kernel-zfcpdump-devel alma-upgrade-kernel-zfcpdump-modules alma-upgrade-kernel-zfcpdump-modules-extra alma-upgrade-perf alma-upgrade-python3-perf References https://attackerkb.com/topics/cve-2021-47412 CVE - 2021-47412 https://errata.almalinux.org/8/ALSA-2024-7000.html https://errata.almalinux.org/8/ALSA-2024-7001.html
